diff --git a/tools/aapt2/StringPool.h b/tools/aapt2/StringPool.h
index 1006ca9..3457e0b 100644
--- a/tools/aapt2/StringPool.h
+++ b/tools/aapt2/StringPool.h
@@ -36,6 +36,10 @@
   std::string name;
   uint32_t first_char;
   uint32_t last_char;
+
+  bool operator==(const Span& right) const {
+    return name == right.name && first_char == right.first_char && last_char == right.last_char;
+  }
 };
 
 struct StyleString {